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Title Transcription
シマネケン ニ オケル 2001ネン イコウ ノ ジシン カツドウ ト チケイ オヨビ チシツ トノ ヒカク
Title Alternative (English)
Seismicity of recent years after 2001 in Shimane Prefecture and its implication to the local geomorphology and geology
File
language
jpn
Author
Description
This study demonstrates the detailed correlation of recent seismicity (2001-2010) with geomorphological analyses, surface geology and gravity anomaly in Shimane Prefecture, southwestern Honshu, Japan. The epicenter distribution of small earthquakes is characterized by the NE-SW zonal concentration extending from the northern part of Yamaguchi Prefecture to around Mt. Sambe in Oda City (Yamaguchi-Izumo Intra-Plate Seismic Zone: YISZ). With the conjugate sense of the seismic zone, relatively small zone of NNW-SSE trending are observed from Mt. Sambe to Miyoshi City, Hiroshima Prefecture (Sambe-Miyoshi Seismic Zone: SMSZ).
The YISZ can be correlated with the geomorphological boundary between the Tsunozu and Kibi Low-relief Surfaces in the Iwami Highland. With respect to the steep gradient of gravity anomaly, a concealed tectonic line related to the deposition of the Pliocene Tsunozu Formation is implied just beneath the seismic zone. It suggests that the recent activity of the seismic zone occurs at the concealed tectonic line under the present ENE-WSW compression field.
Around the SMSZ, many lineaments with N30°W and N60°W trending are recognized. These trending directions are generally concordant with the focal mechanisms of earthquakes in this region. According to the detailed epicenter distribution in the seismic zone, NNW-trending small segments of seismicity are recognized with a right-stepping arrangement. It indicates that the right-stepping pattern in the seismic zone might be originated by the left-lateral slip of a concealed NW-SE tectonic line.
Subject
seismicity
geomorphology
geology
Bouguer gravity anomaly
Shimane Prefecture
Journal Title
Geoscience reports of Shimane University
Volume
35
Start Page
17
End Page
24
ISSN
13439774
Published Date
2016-12
NCID
AA11455176
Publisher
島根大学大学院総合理工学研究科地球資源環境学教室
Publisher Aalternative
Graduate School of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
Format
PDF
Rights
島根大学総合理工学部地球資源環境学教室
Text Version
出版社版
Gyoseki ID
e31372
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
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